Ultrastructure and development of the megagametophyte in Eleusine tristachya (Lam.) Lam. (Poaceae)

Eleusine tristachya (Lam.) Lam. is native from subtropical South American climates. Widespread in Argentina and Uruguay, it is frequently found in landscape prairies of the province of Buenos Aires. Megasporogenesis and megagametogenesis in this species were studied using light and transmission micr...

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Detalles Bibliográficos
Autores principales: Lovisolo, M.R., Galati, B.G.
Formato: JOUR
Materias:
Chloridoideae
Embryology
Megagametogenesis
Megasporogenesis
developmental biology
embryonic development
gametogenesis
gametophyte
grass
metabolism
metabolite
microscopy
native species
ultrastructure
Argentina
Buenos Aires [Argentina]
South America
Uruguay
Eleusine
Eleusine tristachya
Poaceae
Polygonum
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03672530_v202_n4_p293_Lovisolo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03672530_v202_n4_p293_Lovisolo
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spelling todo:paper_03672530_v202_n4_p293_Lovisolo2023-10-03T15:28:11Z Ultrastructure and development of the megagametophyte in Eleusine tristachya (Lam.) Lam. (Poaceae) Lovisolo, M.R. Galati, B.G. Chloridoideae Embryology Megagametogenesis Megasporogenesis developmental biology embryonic development gametogenesis gametophyte grass metabolism metabolite microscopy native species ultrastructure Argentina Buenos Aires [Argentina] South America Uruguay Chloridoideae Eleusine Eleusine tristachya Poaceae Polygonum Eleusine tristachya (Lam.) Lam. is native from subtropical South American climates. Widespread in Argentina and Uruguay, it is frequently found in landscape prairies of the province of Buenos Aires. Megasporogenesis and megagametogenesis in this species were studied using light and transmission microscopy. The ovule is hemitropous, bitegmic and tenuinucellate. The megaspore mother cell enlarges and undergoes meiosis division resulting in a T-shaped tetrad of megaspores. The three micropylar megaspores degenerate, and the chalazal one develops into the Polygonum-type megagametophyte. The synergid cells have the cytoplasm very electron dense because it has got a rich complement of organelles. The synergid wall is strongly thickened at the micropylar pole, developing the filiform apparatus. At maturity, the antipodals originate a wall with large projections into the cytoplasm, acquiring transfer cells characteristics. The antipodals cytoplasm, enriched with organelles shows a high metabolic activity, and it is suggested that these cells perform as an efficient system for metabolites transport. © 2007 Elsevier GmbH. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03672530_v202_n4_p293_Lovisolo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Chloridoideae
Embryology
Megagametogenesis
Megasporogenesis
developmental biology
embryonic development
gametogenesis
gametophyte
grass
metabolism
metabolite
microscopy
native species
ultrastructure
Argentina
Buenos Aires [Argentina]
South America
Uruguay
Chloridoideae
Eleusine
Eleusine tristachya
Poaceae
Polygonum
spellingShingle Chloridoideae
Embryology
Megagametogenesis
Megasporogenesis
developmental biology
embryonic development
gametogenesis
gametophyte
grass
metabolism
metabolite
microscopy
native species
ultrastructure
Argentina
Buenos Aires [Argentina]
South America
Uruguay
Chloridoideae
Eleusine
Eleusine tristachya
Poaceae
Polygonum
Lovisolo, M.R.
Galati, B.G.
Ultrastructure and development of the megagametophyte in Eleusine tristachya (Lam.) Lam. (Poaceae)
topic_facet Chloridoideae
Embryology
Megagametogenesis
Megasporogenesis
developmental biology
embryonic development
gametogenesis
gametophyte
grass
metabolism
metabolite
microscopy
native species
ultrastructure
Argentina
Buenos Aires [Argentina]
South America
Uruguay
Chloridoideae
Eleusine
Eleusine tristachya
Poaceae
Polygonum
description Eleusine tristachya (Lam.) Lam. is native from subtropical South American climates. Widespread in Argentina and Uruguay, it is frequently found in landscape prairies of the province of Buenos Aires. Megasporogenesis and megagametogenesis in this species were studied using light and transmission microscopy. The ovule is hemitropous, bitegmic and tenuinucellate. The megaspore mother cell enlarges and undergoes meiosis division resulting in a T-shaped tetrad of megaspores. The three micropylar megaspores degenerate, and the chalazal one develops into the Polygonum-type megagametophyte. The synergid cells have the cytoplasm very electron dense because it has got a rich complement of organelles. The synergid wall is strongly thickened at the micropylar pole, developing the filiform apparatus. At maturity, the antipodals originate a wall with large projections into the cytoplasm, acquiring transfer cells characteristics. The antipodals cytoplasm, enriched with organelles shows a high metabolic activity, and it is suggested that these cells perform as an efficient system for metabolites transport. © 2007 Elsevier GmbH. All rights reserved.
format JOUR
author Lovisolo, M.R.
Galati, B.G.
author_facet Lovisolo, M.R.
Galati, B.G.
author_sort Lovisolo, M.R.
title Ultrastructure and development of the megagametophyte in Eleusine tristachya (Lam.) Lam. (Poaceae)
title_short Ultrastructure and development of the megagametophyte in Eleusine tristachya (Lam.) Lam. (Poaceae)
title_full Ultrastructure and development of the megagametophyte in Eleusine tristachya (Lam.) Lam. (Poaceae)
title_fullStr Ultrastructure and development of the megagametophyte in Eleusine tristachya (Lam.) Lam. (Poaceae)
title_full_unstemmed Ultrastructure and development of the megagametophyte in Eleusine tristachya (Lam.) Lam. (Poaceae)
title_sort ultrastructure and development of the megagametophyte in eleusine tristachya (lam.) lam. (poaceae)
url http://hdl.handle.net/20.500.12110/paper_03672530_v202_n4_p293_Lovisolo
work_keys_str_mv AT lovisolomr ultrastructureanddevelopmentofthemegagametophyteineleusinetristachyalamlampoaceae
AT galatibg ultrastructureanddevelopmentofthemegagametophyteineleusinetristachyalamlampoaceae
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